CYPEINODONT FISHES. 993 



Priapella BONiTA. (Text-fig. 170 E.) 



Gamhusia bonita Meek, Publ. Columbian Mus., Zool. v. 1904, 

 p. 132, fig. 39; Regan, Biol. Oentr.-Amer., Pisces, p. 95 

 (1907). 



Rio Papaloapam in Mexico. 



7. PsEUDOxiPHOPHORUs Bleek., 1863. 



Atl. Ichth. iii. p. 140; Giinth. Cat. Fish. vi. p. 332 (1866). 



Differs from Priapichthys in the longer dorsal fan originating 

 in advance of the anal ( 5 ) and in the structure of the intro- 

 mittent organ (text-fig. l70C), with the anterior branch of the 

 second prolonged ray ending in an unsegmented antrorse hook, 

 at the base of which the first and third prolonged rays terminate. 



There are three species from Mexico and Central America, but 

 males of one only {P. himaculatus) have been described. 



1. PSEUDOXIPHOPHORUS TERRABENSIS. 



Gamhusia terrabensis Regan, Ann. Mag. N. H. (7) xix. 1907, 

 p. 260; Biol. Centr.-Amer., Pisces, p. 97, pi. xii. fig. 7 (1907). 



Dorsal 12-14; origin nearly equidistant from tip of snout and 

 base of caudal. Anal 9-10 ; origin nearly below middle of dorsal. 

 No dai'k spot above pectoral. 



Rio Grande de Terraba, Costa Rica. 



2. PsEUDOXIPHOPHORUS JONESII. 



Mollienisia jonesii Giinth. Ann. Mag. N. H. (4) xiv. 1874, 

 p. 371. 



Pseudoxiphopkorus pauciradiatus Regan, Ann. Mag. N. H. (7) 

 xiii. 1904, p. 256 and xvi. 1905, p. 362. 



Gamhusia jonesii Regan, Biol. Centr.-Amer., Pisces, p. 97, pi. xii. 

 fig. 8 (1907). 



Dorsal 11-13 ; origin equidistant from tip of snout and middle 

 or posterior part of caudal. Anal 9-11, below anterior part of 

 dorsal. A dark spot above pectoral. 



Mountain lakes and streams of Central Yera Cruz, Mexico. 



3. PsEUDOXIPHOPHORUS BIMACULATUS. (Text-fig. 170 C.) 



Xiphophoriis himacidatus Heck. Sitzungsb. Akad. Wien, i. 1848, 

 p. 296, pi. ix. figs. 1, 2. 



Pseudoxiphopkorus himacidatus Giinth. Cat. Fish. vi. p. 332 

 (1866) ; Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 81. 



Gamhusia himacidata Regan, Biol. Centr.-Amer,, Pisces, p. 98, 

 pi. xiv. fig. 4. 



Dorsal 13-17 ; origin nearly equidistant from tip of snout and 



